APIGW with selective apiKey requirement

MyAPI:
    Type: AWS::Serverless::Api
    Properties:
      Name: MyAPI
      StageName: Default
      EndpointConfiguration: REGIONAL
      Auth:
        ApiKeyRequired: true
      DefinitionBody:
        openapi: 3.0.0
        x-amazon-apigateway-api-key-source : "HEADER"
        paths:
          /public-path:
            get:
              x-amazon-apigateway-integration:
                type: aws_proxy
                httpMethod: POST
                uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${MyFunction.Arn}/invocations
          /path-with-apikey-required:
            get:
              x-amazon-apigateway-integration:
                type: aws_proxy
                httpMethod: POST
                uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${MyFunction.Arn}/invocations

Function1:
  Type: AWS::Serverless::Function
  Properties:
    FunctionName: Function1
    Role: <role.arn>
    Handler: <handler>
    Events:
      API:
        Type: Api
        Properties:
          Path: /public-path
          Method: ANY
          RestApiId:
            Ref: MyAPI
          Auth:
            ApiKeyRequired: false

Function2:
  Type: AWS::Serverless::Function
  Properties:
    FunctionName: Function2
    Role: <role.arn>
    Handler: <handler>
    Events:
      API:
        Type: Api
        Properties:
          Path: /path-with-apikey-required
          Method: ANY
          RestApiId:
            Ref: MyAPI